Computer use with Receiver

I recently got a free computer from my work, an extra one they were going to toss out. I want to use it to store mp3s and hook it up through my home theater receiver. Hooking it up is no problem i already wired the sound card and video card up and can view the computer display on my tv. My question is do i have to keep using a mouse & keyboard to access the files on the computer or is there some type of software i can get so i can just use a remote control to pick and choose which mp3s i want to play?